the XMLGregorianCalendar datatype is not supported by gson API about google-gson

[GoogleCodeExporter]

Install your own type adapter! And you should avoid reporting bugs against 
ancient versions of GSON.

Original comment by limpbizkit on 10 Oct 2011 at 2:07

• Changed state: WontFix
• Added labels: ****
• Removed labels: ****

[GoogleCodeExporter]

nevertheless this feature is often needed. I found the following code for a 
type adapter wheen googling
public class XMLGregorianCalendarConverter {
    public static class Serializer implements JsonSerializer {
        public Serializer() {
            super();
        }
        public JsonElement serialize(Object t, Type type,
                JsonSerializationContext jsonSerializationContext) {
            XMLGregorianCalendar xgcal = (XMLGregorianCalendar) t;
            return new JsonPrimitive(xgcal.toXMLFormat());
        }
    }
    public static class Deserializer implements JsonDeserializer {
        public Object deserialize(JsonElement jsonElement, Type type,
                JsonDeserializationContext jsonDeserializationContext) {
            try {
                return DatatypeFactory.newInstance().newXMLGregorianCalendar(
                        jsonElement.getAsString());
            } catch (Exception e) {
                return null;
            }
        }
    }
}
register this with
            GsonBuilder gson_builder = new GsonBuilder();
            gson_builder.registerTypeAdapter(XMLGregorianCalendar.class,
                    new XMLGregorianCalendarConverter.Serializer());
            gson_builder.registerTypeAdapter(XMLGregorianCalendar.class,
                    new XMLGregorianCalendarConverter.Deserializer());
            gson = gson_builder.create();

Original comment by [email protected] on 22 Mar 2013 at 4:15

• Added labels: ****
• Removed labels: ****

[GoogleCodeExporter]

[deleted comment]

[GoogleCodeExporter]

I had an issue with the above example. The "jsonElement.getAsString()" method 
would throw an UnSupportedOperation exception and the adapter would always 
returned null. I made a slight modification that worked for me. Here is what I 
used to be able to DeSerialize the XMLGregorianCalendar class to json:

public class XMLGregorianCalendarConverter {
    public static class Serializer implements JsonSerializer {

        public Serializer() {
            super();
        }
        @Override
        public JsonElement serialize(Object t, Type type,
                JsonSerializationContext jsonSerializationContext) {
            XMLGregorianCalendar xgcal = (XMLGregorianCalendar) t;
            return new JsonPrimitive(xgcal.toXMLFormat());
        }

    }
    public static class Deserializer implements JsonDeserializer {

        @Override
        public Object deserialize(JsonElement jsonElement, Type type,
                JsonDeserializationContext jsonDeserializationContext) {
            try {
                JsonObject obj  = jsonElement.getAsJsonObject();
                XMLGregorianCalendar xmlGregCalendar = DatatypeFactory.newInstance().newXMLGregorianCalendar(obj.get("year").getAsInt(), 
                                                                     obj.get("month").getAsInt(), 
                                                                     obj.get("day").getAsInt(), 
                                                                     obj.get("hour").getAsInt(), 
                                                                     obj.get("minute").getAsInt(),obj.get("second").getAsInt(),
                                                                     0, obj.get("timezone").getAsInt());
                return xmlGregCalendar;
            } catch (Exception e) {
                return null;
            }
        }

    }
}

Original comment by [email protected] on 18 Oct 2013 at 2:59

• Added labels: ****
• Removed labels: ****